| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1711 | 
                                    
                                    21.1%
                                 | 
| 1 | yes | 4992 | 
                                    
                                    61.5%
                                 | 
| 8 | dk | 1404 | 
                                    
                                    17.3%
                                 | 
| 9 | 6 | 
                                    
                                    0.1%
                                 | |
| 11 | .Z | 126 |